Performance Analysis of CO-OFDM Schemes Based on Multidimensional Constellations for Long-Haul Transmission

In this paper, we have examined two schemes based on Coherent Optical-Orthogonal Division Multiplexing (CO-OFDM) systems suitable for long-haul transmission. Both take advantage of the Dual Polarization Quadrature Phase-Shift Keying (DPQPSK) constellation. However, the optical transmission is done by time dimension in Time Diversity (TD)-DPQPSK scheme and by the polarization dimension in Polarization Diversity (PD)-DPQPSK scheme. Both schemes have been compared with the 4QAM conventional CO-OFDM system for Back to Back (B2B) configuration and after 1040km and 2000km fiber lengths. The TD-DPQPSK presents enhanced performance in terms of Optical Signal-to-Noise Rate (OSNR) and require half of the optical resources than PD-DPQPSK. Furthermore comparing the TD-DPQPSK scheme with the 4QAM system, the OSNR penalties decrease and the transmitted bit rate is doubled, for the TD-DPQPSK option.Grant numbers : This work was supported by the Spanish MINECO project DESTELLO (TEC2015-69256-R).© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works